TM 5-4210-230-14&P-1VEHICLE MAINTENANCEAXLE-REAR (With Locking Differential)CAUTIONTo avoid personal injury or property damage,pay strict attention to the following:If a truck is equipped with a lockingdifferential, power will be transmitted to theopposite rear wheel or axle if one of the rearwheels or axles slips. Both rear wheels orboth rear axles must be raised free of groundif it is necessary to operate one rear wheelwith truck stationary; otherwise, the wheel oraxle that is not raised will pull vehicle off itssupport.BODY-CABFrequent and regular washing will lengthen the life ofyour new vehicle's painted finish and bright metal trim.WASHING: Wash your vehicle often with warm or coldwater to remove dirt and preserve the original luster of thepaint. Never wash the vehicle in the direct rays of the hot sunor when the sheet metal is hot to the touch, as this may causestreaks on the finish. Do not use hot water or strong soaps ordetergents or wipe off dirt when the surface is dry as this willscratch the paint.WAXING OR POLISHING VEHICLES : Prior to use of anywax or polish, vehicle must be thoroughly washed.BRIGHT METAL CARE: Bright metal such asanodized aluminum, chrome and stainless steel, require thesame washing as painted surfaces. A non-abrasive chromecleaner may be used sparingly to clean the bright metal. Donot use steel wool. Use of automobile wax or polish on brightmetal usually will restore the original brightness.UPHOLSTERY CARE: Use a whisk broom and vacuumcleaner to remove loose dust and dirt from upholstery andfloor. Vinyl and woven plastic upholstery can be washed withwarm water and mild soap, wipe dry. If commercial cleanersare used, follow instructions supplied with cleaner.BRAKES (Air)AIR COMPRESSOR (Air Cleaner)Some engines are equipped with air compressors thathave an air cleaner mounted directly to the air compressor.For servicing, refer to Engine Lubrication Section.AIR RESERVOIR MOISTURE DRAININGMoisture taken in with the air through the compressorinlet valves collects in the reservoirs and NECESSITATESDRAINING THE RESERVOIR DAILY IN COLD WEATHERAND ONCE A WEEK IN WARM WEATHER by opening thedrain cock located either on the bottom of the tank or in theend of the tank. If in the end of the tank, there must be someair pressure in the system to assure proper drainage. Be sureto close the drain cocks after all moisture has been expelled.The Automatic Reservoir Drain Valve ejects moistureand contaminants from the reservoir in which it is connected.It operates automatically and requires no manual assistanceor control lines from other sources.BRAKE ANTILOCK SYSTEMThe brake antilock monitor (warning) light may be usedto quickly trouble shoot the antilock system. The warning lightwill indicate to the operator or serviceman that the system isfunctioning properly or not.Satisfactory SystemA satisfactory antilock system is indicated each timethe ignition key switch is turned to either "ON" or "RUN"position with the antilock warning light momentarilyilluminating, followed by the light going out and remaining off.This indicates that the computer modules are receiving powerand the solenoid valves are properly connected to thecomputer modules.Warning Light Will Not IlluminateNo light when the ignition key switch is turned "ON"could be the result of no power to the antilock system or thelight bulb is burned out. Check for bad fuse or light bulb.Warning Light Remains OnIf the warning light should remain "ON" a problem isindicated in the antilock control system. Should this conditionoccur the service brakes will function in the normal manner;however, the vehicle will not have the added safety andadvantage of the antilock.If the antilock warning light comes on and stays on, theantilock system should have an "Ignition Cycle Check"performed to determine if all or any computer modules and aircontrol valves are operating satisfactorily. Refer to "IgnitionCycle Check".1